Good day!
I'm in the process of swapping to an LS. I purchased chevy frame mounts to replace the olds frame mounts. It appears that I was sent the same mount for both sides. This means that one side has 3 bolts and the other has 4. The olds mounts only used 3. Should I get the correct mounts, or is 3 bolts fine? Attached are the 2 mounts and a pic of what I was supposed to purchase. On that picture notice the holes are slightly different in each mount. I don't have different mounts, I have the same mount with one side having 3 holes. Is it fine/ good only using 3 bolts on a motor mount doing a swap?

3 holes on the bottom

3 holes in top

Only the one on the right has 3 holes.

 

I suppose I can just drill the hole through the frame

 

I got a pair of original used ones from a SBC Chevelle and recall they were mirror images of each other.